Bad Data cryptographicexception in xml using Linq in c# - linq

Question

My XML file:
<?xml version="1.0" encoding="utf-8"?>
<dskh>
<khachhang maso="kh01">
<ten_kh>thehung</ten_kh>
<tuoi_kh>15</tuoi_kh>
<dchi_kh>hochiminh</dchi_kh>
</khachhang>
<khachhang maso="kh02">
<ten_kh>hung</ten_kh>
<tuoi_kh>15</tuoi_kh>
<dchi_kh>hcm</dchi_kh>
</khachhang>
</dskh>
My Encrypt and Decrypt code:
class Program
{
// Call this function to remove the key from memory after use for security.
[System.Runtime.InteropServices.DllImport("KERNEL32.DLL", EntryPoint = "RtlZeroMemory")]
public static extern bool ZeroMemory(ref string Destination, int Length);
// Function to Generate a 64 bits Key.
static string GenerateKey()
{
// Create an instance of Symetric Algorithm. Key and IV is generated automatically.
DESCryptoServiceProvider desCrypto = (DESCryptoServiceProvider)DESCryptoServiceProvider.Create();
// Use the Automatically generated key for Encryption.
return ASCIIEncoding.ASCII.GetString(desCrypto.Key);
}
static void EncryptFile(string sInputFilename,
string sOutputFilename,
string sKey) {
FileStream fsInput = new FileStream(sInputFilename,FileMode.Open,FileAccess.Read);
FileStream fsEncrypted = new FileStream(sOutputFilename,FileMode.Create,FileAccess.Write);
DESCryptoServiceProvider DES = new DESCryptoServiceProvider();
DES.Key = Encoding.UTF8.GetBytes(sKey);
DES.IV = Encoding.UTF8.GetBytes(sKey);
ICryptoTransform desencrypt = DES.CreateEncryptor();
CryptoStream cryptostream = new CryptoStream(fsEncrypted,desencrypt,CryptoStreamMode.Write);
byte[] bytearrayinput = new byte[fsInput.Length - 1];
fsInput.Read(bytearrayinput, 0, bytearrayinput.Length);
cryptostream.Write(bytearrayinput, 0, bytearrayinput.Length);
}
static void DecryptFile(string sInputFilename,
string sOutputFilename,
string sKey)
{
DESCryptoServiceProvider DES = new DESCryptoServiceProvider();
//A 64 bit key and IV is required for this provider.
//Set secret key For DES algorithm.
DES.Key = Encoding.UTF8.GetBytes(sKey);
//Set initialization vector.
DES.IV = Encoding.UTF8.GetBytes(sKey);
//Create a file stream to read the encrypted file back.
FileStream fsread = new FileStream(sInputFilename,
FileMode.Open,
FileAccess.Read);
//Create a DES decryptor from the DES instance.
ICryptoTransform desdecrypt = DES.CreateDecryptor();
//Create crypto stream set to read and do a
//DES decryption transform on incoming bytes.
CryptoStream cryptostreamDecr = new CryptoStream(fsread,
desdecrypt,
CryptoStreamMode.Read);
//Print the contents of the decrypted file.
StreamWriter fsDecrypted = new StreamWriter(sOutputFilename);
fsDecrypted.Write(new StreamReader(cryptostreamDecr).ReadToEnd());
fsDecrypted.Flush();
fsDecrypted.Close();
}
static void Main(string[] args)
{
// Must be 64 bits, 8 bytes.
// Distribute this key to the user who will decrypt this file.
string sSecretKey;
// Get the key for the file to encrypt.
sSecretKey = GenerateKey();
// For additional security pin the key.
GCHandle gch = GCHandle.Alloc(sSecretKey, GCHandleType.Pinned);
// Encrypt the file.
EncryptFile(#"C:\xml_kh.xml",
#"C:\xml_encry.xml",
sSecretKey);
//Decrypt the file.
DecryptFile(#"C:\xml_encry.xml",
#"C:\xml_decry.xml",
sSecretKey);
}
}
When i excute Decrypt code, i get Cryptographicexception: Bad Data here:
//Print the contents of the decrypted file.
StreamWriter fsDecrypted = new StreamWriter(sOutputFilename);
fsDecrypted.Write(new StreamReader(cryptostreamDecr).ReadToEnd());
fsDecrypted.Flush();
fsDecrypted.Close();
Please help me!!!

Answer 1

Add two lines at the end of EncryptFile function:
cryptostream.Flush();
cryptostream.Close();
EDIT
I missed there is one more error:
byte[] bytearrayinput = new byte[fsInput.Length - 1];
s/b
byte[] bytearrayinput = new byte[fsInput.Length];